nbase_str.c

/*************************************************************************** * nbase_str.c -- string related functings in the nbase library. These * * were written by fyodor@insecure.org . * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2004 Insecure.Com LLC. Nmap * * is also a registered trademark of Insecure.Com LLC. This program is * * free software; you may redistribute and/or modify it under the * * terms of the GNU General Public License as published by the Free * * Software Foundation; Version 2. This guarantees your right to use, * * modify, and redistribute this software under certain conditions. If * * you wish to embed Nmap technology into proprietary software, we may be * * willing to sell alternative licenses (contact sales@insecure.com). * * Many security scanner vendors already license Nmap technology such as * * our remote OS fingerprinting database and code, service/version * * detection system, and port scanning code. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. To avoid * * misunderstandings, we consider an application to constitute a * * "derivative work" for the purpose of this license if it does any of the * * following: * * o Integrates source code from Nmap * * o Reads or includes Nmap copyrighted data files, such as * * nmap-os-fingerprints or nmap-service-probes. * * o Executes Nmap and parses the results (as opposed to typical shell or * * execution-menu apps, which simply display raw Nmap output and so are * * not derivative works.) * * o Integrates/includes/aggregates Nmap into a proprietary executable * * installer, such as those produced by InstallShield. * * o Links to a library or executes a program that does any of the above * * * * The term "Nmap" should be taken to also include any portions or derived * * works of Nmap. This list is not exclusive, but is just meant to * * clarify our interpretation of derived works with some common examples. * * These restrictions only apply when you actually redistribute Nmap. For * * example, nothing stops you from writing and selling a proprietary * * front-end to Nmap. Just distribute it by itself, and point people to * * http://www.insecure.org/nmap/ to download Nmap. * * * * We don't consider these to be added restrictions on top of the GPL, but * * just a clarification of how we interpret "derived works" as it applies * * to our GPL-licensed Nmap product. This is similar to the way Linus * * Torvalds has announced his interpretation of how "derived works" * * applies to Linux kernel modules. Our interpretation refers only to * * Nmap - we don't speak for any other GPL products. * * * * If you have any questions about the GPL licensing restrictions on using * * Nmap in non-GPL works, we would be happy to help. As mentioned above, * * we also offer alternative license to integrate Nmap into proprietary * * applications and appliances. These contracts have been sold to many * * security vendors, and generally include a perpetual license as well as * * providing for priority support and updates as well as helping to fund * * the continued development of Nmap technology. Please email * * sales@insecure.com for further information. * * * * As a special exception to the GPL terms, Insecure.Com LLC grants * * permission to link the code of this program with any version of the * * OpenSSL library which is distributed under a license identical to that * * listed in the included Copying.OpenSSL file, and distribute linked * * combinations including the two. You must obey the GNU GPL in all * * respects for all of the code used other than OpenSSL. If you modify * * this file, you may extend this exception to your version of the file, * * but you are not obligated to do so. * * * * If you received these files with a written license agreement or * * contract stating terms other than the terms above, then that * * alternative license agreement takes precedence over these comments. * * * * Source is provided to this software because we believe users have a * * right to know exactly what a program is going to do before they run it. * * This also allows you to audit the software for security holes (none * * have been found so far). * * * * Source code also allows you to port Nmap to new platforms, fix bugs, * * and add new features. You are highly encouraged to send your changes * * to fyodor@insecure.org for possible incorporation into the main * * distribution. By sending these changes to Fyodor or one the * * Insecure.Org development mailing lists, it is assumed that you are * * offering Fyodor and Insecure.Com LLC the unlimited, non-exclusive right * * to reuse, modify, and relicense the code. Nmap will always be * * available Open Source, but this is important because the inability to * * relicense code has caused devastating problems for other Free Software * * projects (such as KDE and NASM). We also occasionally relicense the * * code to third parties as discussed above. If you wish to specify * * special license conditions of your contributions, just say so when you * * send them. * * * * This program is distributed in the hope that it will be useful, but * * WITHOUT ANY WARRANTY; without even the implied warranty of * * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * * General Public License for more details at * * http://www.gnu.org/copyleft/gpl.html , or in the COPYING file included * * with Nmap. * * * ***************************************************************************//* $Id: nbase_str.c 2396 2004-08-29 09:12:05Z fyodor $ */#include "nbase.h"#include <string.h>#ifndef HAVE_STRCASESTRchar *strcasestr(constchar *haystack, constchar *pneedle) {
char buf[512];
unsignedint needlelen;
constchar *p;
char *needle, *q, *foundto;
/* Should crash if !pneedle -- this is OK */if (!*pneedle) return (char *) haystack;
if (!haystack) return NULL;
needlelen = (unsigned int) strlen(pneedle);
if (needlelen >= sizeof(buf)) {
needle = (char *) malloc(needlelen + 1);
} else needle = buf;
p = pneedle; q = needle;
while((*q++ = tolower(*p++)))
;
p = haystack - 1; foundto = needle;
while(*++p) {
if(tolower(*p) == *foundto) {
if(!*++foundto) {
/* Yeah, we found it */if (needlelen >= sizeof(buf))
free(needle);
return (char *) (p - needlelen + 1);
}
} else foundto = needle;
}
if (needlelen >= sizeof(buf))
free(needle);
return NULL;
}
#endifint Strncpy(char *dest, constchar *src, size_t n) {
strncpy(dest, src, n);
if (dest[n-1] == '\0')
return 0;
dest[n-1] = '\0';
return -1;
}
/* Trivial function that returns nonzero if all characters in str of length strlength are printable (as defined by isprint()) */int stringisprintable(constchar *str, int strlength) {
int i;
for(i=0; i < strlength; i++)
if (!isprint((unsignedchar) str[i]))
return 0;
return 1;
}
/* Convert non-printable characters to replchar in the string */void replacenonprintable(char *str, int strlength, char replchar) {
int i;
for(i=0; i < strlength; i++)
if (!isprint( (unsignedchar) str[i]))
str[i] = replchar;
return;
}